You don't have to be present. Merely send a letter of explanation.

你不一定要出席, 只要寄封信去说明一下就可以了.

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She received an official letter of explanation.

她收到一封官方解释函.

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She received an letter of explanation.

她收到了一封解释性的公函.

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Therefore, when the misunderstanding occurred when it is necessary to write a love letter of explanation.

所以, 当发生误会时就有必要写一封解释的情书.

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